U.S. patent number 11,404,502 [Application Number 16/338,597] was granted by the patent office on 2022-08-02 for display substrate and manufacturing method thereof, display panel.
This patent grant is currently assigned to BOE TECHNOLOGY GROUP CO., LTD., HEFEI XINSHENG OPTOELECTRONICS TECHNOLOGY CO., LTD.. The grantee listed for this patent is BOE TECHNOLOGY GROUP CO., LTD., HEFEI XINSHENG OPTOELECTRONICS TECHNOLOGY CO., LTD.. Invention is credited to Minghung Hsu.
United States Patent |
11,404,502 |
Hsu |
August 2, 2022 |
Display substrate and manufacturing method thereof, display
panel
Abstract
A display substrate, a manufacturing method thereof and a
display panel are provided. The display substrate includes a base
and a pixel defining layer provided on the base, the pixel defining
layer includes a plurality of sub-pixel regions, and at least one
storage tank defined by the pixel defining layer is provided in
each of the plurality of sub-pixel regions, and at an identical
height with respect to the base, in a length direction of the
storage tank, an end portion of the storage tank and a portion
between two end portions of the storage tank differ in wettability
to a storage material.
Inventors: |
Hsu; Minghung (Beijing,
CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
HEFEI XINSHENG OPTOELECTRONICS TECHNOLOGY CO., LTD.
BOE TECHNOLOGY GROUP CO., LTD. |
Anhui
Beijing |
N/A
N/A |
CN
CN |
|
|
Assignee: |
HEFEI XINSHENG OPTOELECTRONICS
TECHNOLOGY CO., LTD. (Anhui, CN)
BOE TECHNOLOGY GROUP CO., LTD. (Beijing, CN)
|
Family
ID: |
1000006468461 |
Appl.
No.: |
16/338,597 |
Filed: |
August 31, 2018 |
PCT
Filed: |
August 31, 2018 |
PCT No.: |
PCT/CN2018/103576 |
371(c)(1),(2),(4) Date: |
April 01, 2019 |
PCT
Pub. No.: |
WO2019/085631 |
PCT
Pub. Date: |
May 09, 2019 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20210343804 A1 |
Nov 4, 2021 |
|
Foreign Application Priority Data
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|
|
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Oct 31, 2017 [CN] |
|
|
201711050660.0 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01L
51/56 (20130101); H01L 27/3246 (20130101); H01L
2227/323 (20130101) |
Current International
Class: |
H01L
27/32 (20060101); H01L 51/56 (20060101) |
Field of
Search: |
;257/93 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
102165593 |
|
Aug 2011 |
|
CN |
|
104167430 |
|
Nov 2014 |
|
CN |
|
106601774 |
|
Apr 2017 |
|
CN |
|
207320121 |
|
May 2018 |
|
CN |
|
3113228 |
|
Apr 2017 |
|
EP |
|
2009026669 |
|
Feb 2009 |
|
JP |
|
2013-041136 |
|
Feb 2013 |
|
JP |
|
Other References
The Extended European Search Report dated Aug. 11, 2021; Appln. No.
18857440.4. cited by applicant .
The International Search Report and Written Opinion dated Nov. 16,
2018; PCT/CN2018/103576. cited by applicant.
|
Primary Examiner: Tran; Dzung
Claims
The invention claimed is:
1. A display substrate, comprising a base; a pixel defining layer,
provided on the base, the pixel defining layer including a
plurality of sub-pixel regions, and at least one storage tank
defined by the pixel defining layer being provided in each of the
plurality of sub-pixel regions, wherein a planar shape of the
storage tank is a rectangle, the storage tank includes two opposite
long side walls and two opposite short side walls, the end portion
of the storage tank in the length direction includes the short side
wall; or includes the short side wall and a portion of the long
side wall that is directly connected with the short side wall,
wherein, at an identical height with respect to the base, in a
length direction of the storage tank, a surface of the two opposite
short side walls of the storage tank and a surface of a side wall
between two opposite short side wall of the storage tank differ in
wettability to a storage material.
2. The display substrate according to claim 1, wherein, in the
length direction of the storage tank, at an identical height with
respect to the base, wettability of a surface of the end portion of
the storage tank to the storage material is stronger than
wettability of the surface of the side wall between the two end
portions of the storage tank to the storage material.
3. The display substrate according to claim 2, wherein, in the
length direction of the storage tank, in a direction from the end
portion of the storage tank to a center of the side wall of the
storage tank that is located between the two end portions, at an
identical height with respect to the base, the wettability of the
surface of the tank facing the storage material gradually
decreases.
4. The display substrate according to claim 2, wherein, in the
length direction of the storage tank, a height of the end portion
of the storage tank is larger than a height of the side wall of the
storage tank that is located between the two end portions.
5. The display substrate according to claim 4, wherein, in the
length direction of the storage tank, in the direction from the end
portion of the storage tank to the center of the side wall of the
storage tank that is located between the two end portions, a height
of the storage tank gradually decreases.
6. The display substrate according to claim 1, wherein, at an
identical height with respect to the base, wettability of two ends
of the short side wall to the storage material is weaker than
wettability of a portion of the short side wall that is located
between the two ends to the storage material.
7. The display substrate according to claim 6, wherein, in a
direction from the two ends of the short side wall to the portion
of the short side wall that is located between the two ends, the
height of the storage tank gradually increases.
8. The display substrate according to claim 1, wherein, a slope
angle of a side surface of the long side wall is larger than a
slope angle of a side surface of the short side wall.
9. The display substrate according to claim 1, wherein, in the
length direction of the storage tank, at an identical height with
respect to the base, wettability of a surface of the end portion of
the storage tank to the storage material is weaker than wettability
of a surface of the side wall between the two end portions of the
storage tank to the storage material.
10. The display substrate according to claim 9, wherein, in the
length direction of the storage tank, in a direction from the end
portion of the storage tank to a center of the side wall of the
storage tank that is located between the two end portions, at an
identical height with respect to the base, the wettability of the
surface of the tank facing the storage material gradually
increases.
11. The display substrate according to claim 9, wherein, in the
length direction of the storage tank, a height of the end portion
of the storage tank is smaller than a height of the side wall of
the storage tank that is located between the two end portions.
12. The display substrate according to claim 11, wherein, in the
length direction of the storage tank, in the direction from the end
portion of the storage tank to the center of the side wall of the
storage tank that is located between the two end portions, a height
of the storage tank gradually increases.
13. A display panel, comprising the display substrate, wherein the
display substrate comprises: a base; a pixel defining laver,
provided on the base, the pixel defining layer including a
plurality of sub-pixel regions, and at least one storage tank
defined by the pixel defining layer being provided in each of the
plurality of sub-pixel regions, wherein a planar shape of the
storage tank is a rectangle, the storage tank includes two opposite
long side walls and two opposite short side walls, the end portion
of the storage tank in the length direction includes the short side
wall; or includes the short side wall and a portion of the long
side wall that is directly connected with the short side wall,
wherein, at an identical height with respect to the base, in a
length direction of the storage tank, a surface of the two opposite
short side walls of the storage tank and a surface of a side wall
between two opposite short side walls of the storage tank differ in
wettability to a storage material.
14. The display substrate according to claim 3, wherein, in the
length direction of the storage tank, a height of the end portion
of the storage tank is larger than a height of the side wall of the
storage tank that is located between the two end portions.
15. A manufacturing method of a display substrate, comprising:
providing a base; and forming an insulating material film of on the
base; patterning the insulating material film to form a pixel
defining layer, the pixel defining layer including a plurality of
sub-pixel regions, and at least one storage tank defined by the
pixel defining layer being provided in each of the plurality of
sub-pixel regions, wherein a planar shape of the storage tank is a
rectangle, the storage tank includes two opposite long side walls
and two opposite short side walls, the end portion of the storage
tank in the length direction includes the short side wall; or
includes the short side wall and a portion of the long side wall
that is directly connected with the short side wall, wherein, at an
identical height with respect to the base, in a length direction of
the storage tank, a surface of the two opposite short side walls of
the storage tank and a surface of a side wall between two opposite
short side walls of the storage tank differ in wettability to a
storage material.
16. The manufacturing method of the display substrate according to
claim 15, wherein, a material for manufacturing the pixel defining
layer includes a halogen polymer, and the manufacturing method
further comprises: baking the pixel defining layer, so that a
portion of the pixel defining layer away from the base becomes a
lyophobic layer, and a portion of the pixel defining layer close to
the base is transformed into a lyophilic layer.
17. The manufacturing method of the display substrate according to
claim 15, wherein, a material for manufacturing the pixel defining
layer includes a lyophilic photoresist material, and the
manufacturing method further comprises: performing plasma treatment
on a surface of the pixel defining layer away from the base with a
plasma gas including a halogen compound, so that the portion of the
pixel defining layer away from the base has a lyophobic
property.
18. The manufacturing method of the display substrate according to
claim 16, further comprising: treating a surface of the pixel
defining layer with the plasma gas including the halogen compound.
Description
The present application claims priority of Chinese Patent
Application No. 201711050660.0 filed on Oct. 31, 2017, the
disclosure of which is incorporated herein by reference in its
entirety as part of the present application.
TECHNICAL FIELD
At least one embodiment of the present disclosure relates to a
display substrate and a manufacturing method thereof, and a display
panel.
BACKGROUND
An Organic Light-Emitting Diode (OLED) has advantages such as
self-luminescence, wide viewing angle, high contrast, low energy
consumption, fast response speed, so an OLED display product is
increasingly favored by users.
In an actual process, when a structural layer for emitting light in
the OLED is manufactured, it is necessary to provide a storage tank
for storing ink including a corresponding material, and then the
ink is dried to obtain a corresponding structural layer. However,
with respect to a current storage tank structure, in a drying
process of the ink, flatness of a formed structural layer is
relatively poor, which will affect a performance of an organic
light emitting device, and cause poor display of the OLED
product.
SUMMARY
At least one embodiment of present disclosure provides a display
substrate, which comprises: a base; a pixel defining layer,
provided on the base, the pixel defining layer includes a plurality
of sub-pixel regions, and at least one storage tank defined by the
pixel defining layer is provided in each of the plurality of
sub-pixel regions, and at an identical height with respect to the
base, in a length direction of the storage tank, an end portion of
the storage tank and a portion between two end portions of the
storage tank differ in wettability to a storage material.
For example, in the display substrate provided by at least one
embodiment of present disclosure, in the length direction of the
storage tank, at an identical height with respect to the base,
wettability of the end portion of the storage tank to the storage
material is stronger than wettability of the portion between the
two end portions of the storage tank to the storage material.
For example, in the display substrate provided by at least one
embodiment of present disclosure, in the length direction of the
storage tank, in a direction from the end portion of the storage
tank to a center of the storage tank that is located between the
two end portions, at an identical height with respect to the base,
the wettability gradually decreases.
For example, in the display substrate provided by at least one
embodiment of present disclosure, in the length direction of the
storage tank, a height of the end portion of the storage tank is
larger than a height of the portion of the storage tank that is
located between the two end portions.
For example, in the display substrate provided by at least one
embodiment of present disclosure, in the length direction of the
storage tank, in the direction from the end portion of the storage
tank to the center of the storage tank that is located between the
two end portions, a height of the storage tank gradually
decreases.
For example, in the display substrate provided by at least one
embodiment of present disclosure, a planar shape of the storage
tank is a rectangle, the storage tank includes two opposite long
side walls and two opposite short side walls, the end portion of
the storage tank in the length direction includes the short side
wall; or includes the short side wall and a portion of the long
side wall that is connected with the short side wall.
For example, in the display substrate provided by at least one
embodiment of present disclosure, at an identical height with
respect to the base, wettability of two ends of the short side wall
to the storage material is weaker than wettability of a portion of
the short side wall that is located between the two ends to the
storage material.
For example, in the display substrate provided by at least one
embodiment of present disclosure, in a direction from the two ends
of the short side wall to the portion of the short side wall that
is located between the two ends, the height of the storage tank
gradually increases.
For example, in the display substrate provided by at least one
embodiment of present disclosure, a slope angle of a side surface
of the long side wall is larger than a slope angle of a side
surface of the short side wall.
For example, in the display substrate provided by at least one
embodiment of present disclosure, a planar shape of the storage
tank is an ellipse, the ellipse includes two long side walls that
are directly connected with and opposite to each other, and the end
portions of the storage tank in the length direction include end
portions of the two long side walls that are located in the length
direction.
For example, in the display substrate provided by at least one
embodiment of present disclosure, in the length direction of the
storage tank, at an identical height with respect to the base,
wettability of the end portion of the storage tank to the storage
material is weaker than wettability of the portion between the two
end portions of the storage tank to the storage material.
For example, in the display substrate provided by at least one
embodiment of present disclosure, in the length direction of the
storage tank, in a direction from the end portion of the storage
tank to a center of the storage tank that is located between the
two end portions, at an identical height with respect to the base,
the wettability gradually increases.
For example, in the display substrate provided by at least one
embodiment of present disclosure, in the length direction of the
storage tank, a height of the end portion of the storage tank is
smaller than a height of the portion of the storage tank that is
located between the two end portions.
For example, in the display substrate provided by at least one
embodiment of present disclosure, in the length direction of the
storage tank, in the direction from the end portion of the storage
tank to the center of the storage tank that is located between the
two end portions, a height of the storage tank gradually
increases.
At least one embodiment of the present disclosure provides a
display panel, which comprises the display substrate according to
any embodiment above.
At least one embodiment of the present disclosure provides a
manufacturing method of a display substrate, which comprises:
providing a base; and forming an insulating material film of on the
base; patterning the insulating material film to form a pixel
defining layer, the pixel defining layer including a plurality of
sub-pixel regions, and at least one storage tank defined by the
pixel defining layer being provided in each of the plurality of
sub-pixel regions, and at an identical height with respect to the
base, in a length direction of the storage tank, an end portion of
the storage tank and a portion between two end portions of the
storage tank differ in wettability to a storage material.
For example, in the manufacturing method of a display substrate
provided by at least one embodiment of present disclosure, a
material for manufacturing the pixel defining layer includes a
halogen polymer, and the manufacturing method further comprises:
baking the pixel defining layer, so that a portion of the pixel
defining layer away from the base becomes a lyophobic layer, and a
portion of the pixel defining layer close to the base is
transformed into a lyophilic layer.
For example, in the manufacturing method of a display substrate
provided by at least one embodiment of present disclosure, a
material for manufacturing the pixel defining layer includes a
lyophilic photoresist material, and the manufacturing method
further comprises: performing plasma treatment on a surface of the
pixel defining layer away from the base with a gas including a
halogen compound, so that the portion of the pixel defining layer
away from the base has a lyophobic property.
For example, the manufacturing method of a display substrate
provided by at least one embodiment of present disclosure further
comprises: treating a surface of the pixel defining layer with the
plasma gas including the halogen compound.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to clearly illustrate the technical solution of the
embodiments of the invention, the drawings of the embodiments will
be briefly described in the following; it is obvious that the
described drawings are only related to some embodiments of the
invention and thus are not limitative of the invention.
FIG. 1A is a plan view of a storage tank provided with a storage
material;
FIG. 1B is a cross-sectional view of the storage tank shown in FIG.
1A taken along A-B;
FIG. 2 is a plan view of a display substrate provided by an
embodiment of the present disclosure;
FIG. 3 is a plan view of a sub-pixel region of the display
substrate shown in FIG. 2;
FIG. 4A is a perspective view of a storage tank in the display
substrate shown in FIG. 3;
FIG. 4B is a side view of the storage tank in the display substrate
shown in FIG. 3;
FIG. 4C is a front view of the storage tank in the display
substrate shown in FIG. 3;
FIG. 4D is a cross-sectional view of the storage tank in the
display substrate shown in FIG. 3;
FIG. 4E is another cross-sectional view of the storage tank in the
display substrate shown in FIG. 3;
FIG. 4F is another cross-sectional view of the storage tank in the
display substrate shown in FIG. 3;
FIG. 5A is a front view of another storage tank in the display
substrate shown in FIG. 3;
FIG. 5B is a side view of another storage tank in the display
substrate shown in FIG. 3;
FIG. 5C is a cross-sectional view of another storage tank in the
display substrate shown in FIG. 3;
FIG. 5D is another cross-sectional view of another storage tank in
the display substrate shown in FIG. 3;
FIG. 6 is a plan view of another sub-pixel region in a display
substrate provided by an embodiment of the present disclosure;
FIG. 7A is a front view of a storage tank in the display substrate
shown in FIG. 6;
FIG. 7B is a side view of the storage tank in the display substrate
shown in FIG. 6;
FIG. 8A is a front view of another storage tank in the display
substrate shown in FIG. 6;
FIG. 8B is a side view of another storage tank in the display
substrate shown in FIG. 6; and
FIG. 9 is a partial structural schematic diagram of a display
substrate provided by an embodiment of the present disclosure.
REFERENCE SIGNS
1--pixel defining layer, 2--storage tank; 3--structural layer;
100--base; 200--pixel defining layer; 210--sub-pixel region;
300--storage tank; 310--long side wall; 320--short side wall;
400--organic light emitting device; 410--first electrode;
420--light emitting layer; 430--second electrode; 500--thin film
transistor.
DETAILED DESCRIPTION
In order to make objects, technical details and advantages of the
embodiments of the invention apparent, the technical solutions of
the embodiment will be described in a clearly and fully
understandable way in connection with the drawings related to the
embodiments of the invention. It is obvious that the described
embodiments are just a part but not all of the embodiments of the
invention. Based on the described embodiments herein, those skilled
in the art can obtain other embodiment(s), without any inventive
work, which should be within the scope of the invention.
Unless otherwise defined, all the technical and scientific terms
used herein have the same meanings as commonly understood by one of
ordinary skill in the art to which the present disclosure belongs.
The terms, such as "first," "second," or the like, which are used
in the description and the claims of the present disclosure, are
not intended to indicate any sequence, amount or importance, but
for distinguishing various components. The terms, such as
"comprise/comprising," "include/including," or the like are
intended to specify that the elements or the objects stated before
these terms encompass the elements or the objects and equivalents
thereof listed after these terms, but not preclude other elements
or objects. The terms, such as "connect/connecting/connected,"
"couple/coupling/coupled" or the like, are not limited to a
physical connection or mechanical connection, but may include an
electrical connection/coupling, directly or indirectly. The terms,
"on," "under," "left," "right," or the like are only used to
indicate relative position relationship, and when the position of
the object which is described is changed, the relative position
relationship may be changed accordingly.
In a manufacturing procedure of an Organic Light-Emitting Diode
(OLED), a part of structures in the OLED are usually manufactured
by using an inkjet printing method. Exemplarily, a storage tank may
be provided in a pixel defining layer, and then ink (including a
material that may form a part of structural layers in the OLED) is
dropped into the storage tank, which is dried to obtain a
corresponding structural layer in the OLED.
However, in an actual process, a shape of the storage tank is
usually designed to be rectangular, due to a design structure of a
display product such as an aperture ratio. For example, the
rectangle is an oblong, ink is distributed differently at
interfaces of a long side and a short side of the rectangular
storage tank, and accordingly, drying processes of the ink at the
long side and the short side of the storage tank are also different
from each other. In addition, in the drying process of the ink, as
comprehensively affected by various other factors, for example,
vacuum degree, temperature, time, material (for example, properties
of different materials in the ink) and other process conditions,
flatness of the formed structural layer is relatively poor, and a
difference in flatness of the structural layer is also different in
degree between a length direction and a width direction of the
rectangular storage tank.
FIG. 1A is a plan view of a storage tank provided with a storage
material, and FIG. 1B is a cross-sectional view of the storage tank
shown in FIG. 1A taken along A-B. For example, as shown in FIG. 1A
and FIG. 1B, a pixel defining layer 1 defines a shape of a storage
tank 2, and a structural layer 3 is formed in the storage tank 2.
Usually, a surface layer of the pixel defining layer 1 has a
lyophobic property (with reference to F regions in FIG. 1B), and
other portion of the pixel defining layer 1 has a lyophilic
property, so that ink can be adsorbed in the storage tank 2. In a
process of manufacturing the structural layer 3, ink is firstly
dropped into the storage tank 2, the ink is a mixed liquid, for
example, including a solvent and a solute (the solute may form the
structural layer 3), and the solute and the solvent are different
in properties such as fluidity, which renders uneven distribution
of the solute during an entire drying process, resulting in poor
flatness of the structural layer 3.
During the drying process, as the solvent evaporates, a viscosity
of the ink increases and a surface tension decreases, and the ink
climbs upward at an edge of the storage tank, so that the solvent
volatilizes faster at an edge position of the storage tank than in
a central region, which causes the ink in the storage tank to flow.
If the solute has good fluidity, a large amount of solute will flow
with the solvent to the edge of the storage tank during the drying
process, and after the drying process, the solute is mainly
distributed in an edge region of the storage tank, so that a planar
shape of the structural layer is concave. Accordingly, if the
solute has poor fluidity, then during the drying process, the
solute close to the edge of the storage tank will climb upward
along the edge of the storage tank as driven by flow of the
solvent, while the solute close to the central region of the
storage tank will be retained in a large amount, as shown in FIG.
1B, so that a planar shape of a main body portion of the structural
layer 3 located in a C region is convex. The above-described
difference in flatness (for example, concave or convex) of the
structural layer 3 may result in a defect in an OLED structure.
Moreover, as affected by various process factors as described
above, the difference in flatness of the formed structural layer
may be mainly manifested in a length direction of the storage tank,
or may also be manifested in a width direction of the storage
tank.
At least one embodiment of the present disclosure provides a
display substrate and a manufacturing method thereof, and a display
panel. The display substrate comprises: a base; and a pixel
defining layer provided on the base, wherein, the pixel defining
layer includes a plurality of sub-pixel regions, each sub-pixel
region is provided therein with at least one storage tank formed as
enclosed by the pixel defining layer; at a same height with respect
to the base, in a length direction of the storage tank, an end
portion of the storage tank and a portion between two end portions
of the storage tank differ in wettability to a storage material. On
a same horizontal plane, respective portions of the storage tank
differ in wettability to the storage material; and distribution of
wettability in respective regions of the storage tank may be
designed according to distribution of the storage material in a
drying process, to control an interface of the storage material in
the drying process, so as to improve flatness of a structural layer
formed of the storage material, and further improve a yield of the
display substrate.
Hereinafter, a display substrate and a manufacturing method
thereof, and a display panel provided by at least one embodiment of
the present disclosure will be described in conjunction with the
accompanying drawings.
FIG. 2 is a plan view of a display substrate provided by an
embodiment of the present disclosure, and FIG. 3 is a plan view of
one sub-pixel region of the display substrate shown in FIG. 2.
In at least one embodiment of the present disclosure, as shown in
FIG. 2 and FIG. 3, the display substrate may comprise a base 100
and a pixel defining layer 200 provided on the base 100, wherein,
the pixel defining layer 200 may include a plurality of sub-pixel
regions 210, each sub-pixel region 210 is provided therein with at
least one storage tank 300 formed as enclosed by the pixel defining
layer 200; at a same height with respect to the base 100 (for
example, in a same plane parallel to a plane where the base 100 is
located), in a length direction of the storage tank 300, an end
portion of the storage tank 300 and a portion between two end
portions of the storage tank 300 (for example, two opposite end
portions E1 and E2 shown in FIG. 3 below) differ in wettability to
a storage material.
Distribution of the difference in flatness of a structural layer
formed of the storage material is related to a shape of the storage
tank. In the embodiment of the present disclosure, a planar shape
of the storage tank 300 will not be limited.
For example, in at least one embodiment of the present disclosure,
a planar shape of a storage tank may be a rectangle, the storage
tank includes two opposite long side walls and two opposite short
side walls; an end portion of the storage tank in a length
direction includes a short side wall; or includes the short side
wall and a portion of the long side wall that is directly connected
with the short side wall. In the embodiment of the present
disclosure, a length of the portion of the long side wall that is
directly connected with the short side wall will not be limited.
For example, the length of the portion of the long side wall that
is connected with the short side wall may be, for example, 1/2, 1/3
or 1/5 (which may be any numerical value in a range from 0 to 1/2)
of a half of the long side wall. Exemplarily, as shown in FIG. 3, a
rectangular storage tank 300 includes two opposite long side walls
310 and two opposite short side walls 320; an end portion of the
storage tank 300 in a length direction includes a short side wall
320; or the end portion of the storage tank 300 in the length
direction includes the short side wall 320 and a portion of the
long side wall 310 that is directly connected with the short side
wall 320 (for example, portions within dashed boxes E1 and E2 in
FIG. 3). Hereinafter, technical solutions in the following
embodiments of the present disclosure will be described with a case
where the planar shape of the storage tank 300 is a rectangle as an
example.
Hereinafter, a spatial rectangular coordinate system is established
to describe a shape of the storage tank and positions of respective
structures in the display substrate. Exemplarily, as shown in FIG.
2 and FIG. 3, an overall extending direction of the two long side
walls 310 is set to the length direction of the storage tank 300,
and a direction perpendicular to the length direction is a width
direction of the storage tank 300. In the spatial rectangular
coordinate system, a direction of an X-axis is the width direction
of the storage tank, a direction of a Y-axis is the length
direction of the storage tank, and a direction of a Z-axis (not
shown, with reference to FIG. 4B) is a direction perpendicular to a
plane where the base 100 is located.
In an actual process, the difference in flatness (for example, the
planar shape is convex or concave) of the structural layer formed
of the storage material may be mainly distributed along the X-axis
direction (the width direction of the storage tank 300), or may
also mainly be distributed along the Y-axis direction (the length
direction of the storage tank 300), that is, a difference in
flatness in the X-axis direction is relatively great, or a
difference in flatness in the Y-axis direction is relatively great.
Therefore, in some embodiments of the present disclosure, with
respect to a case where a difference in flatness in the X-axis
direction is relatively great, a storage tank 300 may be configured
to mainly reduce a difference in flatness of a structural layer
formed of a storage material in the X-axis direction; in other
embodiments, with respect to a case where a difference in flatness
in the Y-axis direction is relatively great, a storage tank 300 may
be configured to mainly reduce a difference in flatness of a
structural layer formed of a storage material in the Y-axis
direction.
Hereinafter, a display substrate according to at least one
embodiment of the present disclosure will be described according to
different arrangement modes of the above-described storage tank
300.
For example, in at least one embodiment of the present disclosure,
a storage tank 300 is configured to mainly reduce a difference in
flatness of a storage material in a Y-axis direction, FIG. 4A is a
perspective view of the storage tank in the display substrate shown
in FIG. 3, FIG. 4B is a side view of the storage tank in the
display substrate shown in FIG. 3, and FIG. 4C is a front view of
the storage tank in the display substrate shown in FIG. 3.
For example, in at least one embodiment of the present disclosure,
in a length direction of a storage tank, at a same height with
respect to a base, wettability of an end portion of the storage
tank to a storage material is stronger than wettability of a
portion between two end portions of the storage tank to the storage
material. In the embodiment of the present disclosure, a
wettability variation relationship among different portions in the
storage tank will not be limited, for example, distribution of
wettability may gradually change. For example, in at least one
embodiment of the present disclosure, in a length direction of a
storage tank, in a direction from an end portion of the storage
tank to a center of the storage tank that is located between two
end portions, at a same height with respect to a base, wettability
gradually decreases. Exemplarily, as shown in FIG. 4A to FIG. 4C,
in a direction from a short side wall 320 (or the short side wall
320 and a portion of a long side wall 310 that is directly
connected with the short side wall 320) to a center of the long
side wall 310, at a same height with respect to the base,
wettability of a storage tank 300 to a storage material gradually
decreases. The storage tank 300 of the above-described structure
can reduce, for example, a climbing ability of the storage material
in an intermediate region of the long side wall 310 (a region
between the two end portions of the long side wall 310), so as to
reduce a flow volume of the storage material towards the
intermediate region of the long side wall 310 during an evaporating
and drying process of the storage material, which, thus, may
improve distribution uniformity of the storage material in a
direction of a Y-axis, and ultimately improve flatness of a
structure formed of the storage material.
It should be noted that, in at least one embodiment of the present
disclosure, distribution of wettability may not gradually change,
as long as wettability of an end portion of a storage tank to a
storage material is stronger than wettability of a portion between
two end portions of the storage tank to the storage material. For
example, in at least one embodiment of the present disclosure,
wettability of a portion between two end portions of a storage tank
may be the same; or partially the same, partially different.
In at least one embodiment of the present disclosure, a mode for
implementing a structure of the storage tank 300 as shown in FIG.
4A to FIG. 4C will not be limited. Hereinafter, in several
embodiments of the present disclosure, several technical solutions
that may implement the structure of the above-described storage
tank 300 will be provided.
For example, in at least one embodiment of the present disclosure,
in a length direction of a storage tank, a height of an end portion
of the storage tank is larger than a height of a portion of the
storage tank that is located between two end portions. Exemplarily,
as shown in FIG. 4B, a height of a short side wall 320 is larger
than a height of a long side wall 310 (regardless of a common
boundary where the long side wall 310 and the short side wall 320
are directly connected with each other); or a height of the short
side wall 320 and a portion of the long side wall 310 that is
directly connected with the short side wall 320 is larger than a
height of a remaining portion of the long side wall 310 of the
storage tank 300; or a height of an end portion of the long side
wall 310 and the short side wall 320 is larger than a height of the
remaining portion of the long side wall 310.
For example, in at least one embodiment of the present disclosure,
in a length direction of a storage tank, in a direction from an end
portion of the storage tank to a center of a portion of the storage
tank that is located between two end portions, at a same height
with respect to a base, a lyophobic property of the storage tank
gradually increases. Exemplarily, as shown in FIG. 4B, at a same
height with respect to a base 100, a lyophobic property of a long
side wall 310 is stronger than a lyophobic property of a short side
wall 320; or a lyophobic property of an intermediate portion of the
long side wall 310 is stronger than a lyophobic property of the
short side wall 320 and an end portion of the long side wall
310.
For example, after a storage tank 300 having a shape (for example,
of a rectangle) as shown in FIG. 4B is formed in a pixel defining
layer 200, the pixel defining layer 200 is processed, so that a
side of the pixel defining layer 200 away from the base 100 has a
lyophobic property, and a side of the pixel defining layer 200
close to the base 100 has a lyophilic property. There may be no
clear boundary between a lyophobic property and a lyophilic
property in the pixel defining layer 200, and as a distance from
the base 100 increases, the pixel defining layer 200 may gradually
changes from lyophilic to lyophobic. The height of the end portion
of the long side wall 310 is larger than the height of the portion
between the two end portions, so at a same height with respect to
the base 100, a lyophobic property of the storage tank 300 with
respect to the storage material also gradually increases in a
direction from the end portion to the center between the two end
portions. It should be noted that, the lyophobic property and the
lyophilic property are addressed with respect to the storage
material. Exemplarily, a lyophobic property gradually increases in
the direction from the end portion of the long side wall 310 to the
center between the two end portions, which is equivalent to that a
lyophilic property gradually decreases in the direction from the
end portion of the long side wall 310 to the center between the two
end portions.
In at least one embodiment of the present disclosure, a position of
a region where a height of a storage tank 300 is the smallest (for
example, a portion having a smallest distance from a base 100, at
an edge of a long side wall 310 that is away from the base) will
not be limited, and the position may be any region located between
two end portions of the long side wall 310.
For example, in at least one embodiment of the present disclosure,
in a length direction of a storage tank, in a direction from an end
portion of the storage tank to a center of the storage tank that is
located between two end portions, a height of a side wall of the
storage tank gradually decreases. Exemplarily, as shown in FIG. 4B,
with respect to each long side wall 310, in a direction from an end
portion of the long side wall 310 to a center between two end
portions, the height of the side wall of the storage tank gradually
decreases, that is, a portion of the storage tank 300 having the
smallest height may be located at the center of the long side wall
310.
In at least one embodiment of the present disclosure, a specific
implementation mode by which a portion of a pixel defining layer
200 away from a base 100 (for example, a surface of the pixel
defining layer 200) has a lyophobic property will not be limited,
and specific contents of embodiments below (embodiments about a
manufacturing method of a display substrate) may be referred to,
which will not be repeated here.
For example, in at least one embodiment of the present disclosure,
a storage tank further includes a width direction perpendicular to
a length direction (for example, a direction parallel to an X
axis); for example, an extending direction of a short side wall of
the storage tank may be parallel to the width direction. For
example, in at least one embodiment of the present disclosure, at a
same height with respect to a base, wettability of both ends of the
short side wall to a storage material is weaker than wettability of
a portion of the short side wall that is located between the two
ends to the storage material. Exemplarily, as shown in FIG. 4C, in
a direction parallel to an X-axis, in a direction from an end
portion of a short side wall 320 to an intermediate portion (for
example, a center) of the short side wall 320, at a same height
with respect to a base 100, wettability of a storage tank 300 to a
storage material gradually increases. In this way, for example, a
climbing ability of the storage material in a region close to a
long side wall 310 may be further reduced, so as to further reduce
a flow volume of the storage material toward the long side wall 310
during a drying process, which improves distribution uniformity of
the storage material in a direction of a Y-axis, and improves
flatness of a structure formed of the storage material.
In at least one embodiment of the present disclosure, related
description of a solution about a long side walls 310 as shown in
FIG. 4B may be referred to for a method for implementing
distribution of wettability of a short side wall 320 as shown in
FIG. 4C, which will not be repeated here.
For example, in at least one embodiment of the present disclosure,
in a direction from both ends of a short side wall to a portion of
the short side wall that is located between the two ends, a height
of a storage tank gradually increases. Exemplarily, as shown in
FIG. 4C, with respect to each short side wall 320, in a direction
from an end portion of a short side wall 320 to a center of the
short side wall 320, a height of the short side wall 320 gradually
increases. For example, in at least one embodiment of the present
disclosure, in a direction from both ends of a short side wall to a
portion of the short side wall that is located between the two
ends, at a same height with respect to a base, a lyophobic property
of a storage tank gradually decreases. Exemplarily, as shown in
FIG. 4C, with respect to each short side wall 320, in a direction
from an end portion of a short side wall 320 to a center of the
short side wall 320, at a same height with respect to a base 100, a
lyophobic property gradually decreases.
For example, in at least one embodiment of the present disclosure,
a slope angle of a side surface of a long side wall is larger than
a slope angle of a side surface of a short side wall. FIG. 4D is a
cross-sectional view of a storage tank in the display substrate
shown in FIG. 3, which is a cross-sectional view of a storage tank
300 along a width direction; and FIG. 4E is another cross-sectional
view of the storage tank in the display substrate shown in FIG. 3,
which is a cross-sectional view of the storage tank 300 along a
length direction. Exemplarily, a slope angle of a long side wall
310 (a slope angle of a side surface at the long side wall 310) is
smaller than a slope angle of a short side wall 320 (a slope angle
of a side surface at the short side wall 320), that is, the short
side wall 320 is steeper than the long side wall 310. For example,
as shown in FIG. 4D and FIG. 4E, a slope angle Q1 of the long side
wall 310 is an included angle between a plane where the long side
wall 310 is located and a plane where a base 100 is located, and a
slope angle Q2 of the short side wall 320 is an included angle
between a plane where the short side wall 320 is located and a
plane where the base 100 is located. As compared with the short
side wall 320, the long side wall 310 has a smaller slope angle, so
that, for example, a climbing ability of a storage material on the
long side wall 310 is weaker than, for example, a climbing ability
of the storage material on the short side wall 320, which may
further reduce a flow volume of the storage material toward the
long side wall 310, and improve flatness of a structure formed of
the storage material.
In at least one embodiment of the present disclosure, a degree of a
difference between a slope angle Q1 of a long side wall 310 of a
storage tank and a slope angle Q2 of a short side wall 320 of the
storage tank will not be limited, which may be designed according
to actual needs. For example, in at least one embodiment of the
present disclosure, a difference between a slope angle Q1 of a long
side wall 310 of a storage tank 300 and a slope angle Q2 of a short
side wall 320 of the storage tank 300 is no less than 15 degrees.
Exemplarily, in a storage tank structure shown in FIG. 4D and FIG.
4E, a value obtained by deducting the slope angle Q1 of the long
side wall 310 from the slope angle Q2 of the short side wall 320 is
no less than 15 degrees.
It should be noted that, in at least one embodiment of the present
disclosure, a mode for forming slope angles of a long side wall 310
and a short side wall 320 of a storage tank 300 will not be
limited, and a surface of the long side wall 310 and a surface of
the short side wall 320 are not limited to a flat surface as shown
in FIG. 4D to FIG. 4E, and may also be an arc surface, and the
like.
FIG. 4F is another cross-sectional view of a storage tank in the
display substrate shown in FIG. 3.
For example, in at least one embodiment of the present disclosure,
as shown in FIG. 4F, a storage tank 300 in a pixel defining layer
200 is usually formed by using a photolithographic patterning
process with a mask; for example, a mask pattern in the mask may
correspond to a position where the storage tank 300 is located. In
an exposure process, in an edge region of the mask pattern
(corresponding to an L1 region in FIG. 4F), light for exposure may
cause a phenomenon such as interference or scattering, resulting in
uneven exposure of a photoresist material in the L1 region, which
makes a side surface of the storage tank 300, for example, a long
side wall 310, to be an oblique surface, while in an actual
process, the oblique surface is usually an are surface. A
scattering degree or an interfering degree of light in the L1
region is related to a difference in light transmittance between
the mask pattern and a peripheral region (for example,
corresponding to an L2 region) of the mask pattern. The greater the
difference in the light transmittance between the mask pattern and
the peripheral region of the mask pattern, the steeper the formed
oblique surface (for example, the long side wall 310 or the short
side wall 320), so that an oblique surface, for example, the long
side wall 310 or the short side wall 320, having different slope
angles may be formed according thereto, which may further allow
different portions of the long side walls 310 or the short side
walls 320 to have different slope angles. In the embodiment of the
present disclosure, the pixel defining layer may be subjected to a
photolithographic patterning process by using, for example, a
half-mask process, to form a storage tank structure having
different shapes, which will not increase a flow of a manufacturing
process of a display substrate, as compared with a current
manufacturing process of a storage tank.
For example, in at least one embodiment of the present disclosure,
a photolithographic patterning process, for example, may include:
coating a photoresist layer on a structural layer that needs to be
patterned, exposing the photoresist layer with a mask, developing
the exposed photoresist layer to obtain a photoresist pattern,
etching the structural layer with the photoresist pattern, and then
optionally removing the photoresist pattern.
In at least one embodiment of the present disclosure, a material
for manufacturing a pixel defining layer 200 will not be limited.
For example, in some embodiments of the present disclosure, a pixel
defining layer 200 may be made of an insulating material, and
contents in the foregoing embodiment may be referred to for a
photolithographic patterning process for forming a storage tank 300
in the pixel defining layer 200, which will not be repeated here.
For example, in other embodiments of the present disclosure, a
material for manufacturing a pixel defining layer 200 may further
be a photoresist material (photoresist), and a photolithographic
patterning process for forming a storage tank 300 in the pixel
defining layer 200 may include: coating a photoresist layer on a
base 100, exposing the photoresist layer with a mask, and
developing the exposed photoresist layer to obtain the pixel
defining layer 200 in which the storage tank 300 is formed.
In at least one embodiment of the present disclosure, a width of a
projection (corresponding to an L1 region in FIG. 4F) of a side
surface, for example, a long side wall 310, of a storage tank 300
on a base 100 will not be limited. For example, a width of a
projection of the long side wall 310 or a short side wall 320 on
the base 100 may be about 1 to 15 microns, and may further be about
3 microns.
In the embodiment as shown in FIG. 4A to FIG. 4F in the present
disclosure, a height variation relationship between the long side
wall 310 and the short side wall 320 (an overall height of the
short side wall 320 is larger than an overall height of the long
side wall 310) will not be limited. For example, the height
variation relationship between the long side wall 310 and the short
side wall 320 may gradually change. Exemplarily, from a center of
the short side wall 320 to a center of the long side wall 310, a
height of an edge of the storage tank 300 away from the base 100
decreases smoothly.
In at least one embodiment of the present disclosure, a height
difference between two end portions (for example, long side walls
310) of a storage tank 300 that are located in a width direction
and two end portions (for example, short side walls 320) of the
storage tank 300 that are located in a length direction will not be
limited. For example, in at least one embodiment of the present
disclosure, as shown in FIG. 4F, a maximum height difference
between a long side wall 310 and a short side wall 320 is no less
than about 0.5 microns. Exemplarily, with the storage tank
structure as shown in FIG. 4A to FIG. 4F as an example, a
difference between a maximum height of the short side wall 320 (for
example, a height at a center of the short side wall 320) and a
minimum height of the long side wall 310 (for example, a height at
a center of the long side wall 310) is no less than about 0.5
microns.
For example, in at least one embodiment of the present disclosure,
a storage tank 300 is configured to mainly reduce the difference in
flatness of a storage material in an X-axis direction, FIG. 5A is a
front view of another storage tank in the display substrate shown
in FIG. 3, and FIG. 5B is a side view of another storage tank in
the display substrate shown in FIG. 3.
For example, in at least one embodiment of the present disclosure,
in a length direction of a storage tank, at a same height with
respect to a base, wettability of an end portion of the storage
tank to a storage material is weaker than wettability of a portion
between two end portions of the storage tank to the storage
material. In the embodiment of the present disclosure, a
wettability variation relationship among different portions in the
storage tank will not be limited, for example, distribution of
wettability may gradually change. For example, in at least one
embodiment of the present disclosure, in a length direction of a
storage tank, in a direction from an end portion of the storage
tank to a center of the storage tank that is located between two
end portions, at a same height with respect to a base, wettability
of the storage tank gradually increases. Exemplarily, as shown in
FIG. 5A and FIG. 5B, in a direction from a short side wall 320 (or
the short side wall 320 and a portion of a long side wall 310 that
is directly connected with the short side wall 320) to a center of
the long side wall 310, at a same height with respect to a base
100, wettability of a storage tank 300 to a storage material
gradually increases. The storage tank 300 of the above-described
structure can reduce, for example, a climbing ability of the
storage material in two end regions of the long side wall 310, so
as to reduce a flow volume of the storage material in the two end
regions toward the long side wall 310 during an evaporating and
drying process of the storage material, which, thus, may improve
distribution uniformity of the storage material in a direction of
an X-axis, and ultimately improve flatness of a structure formed of
the storage material.
In at least one embodiment of the present disclosure, a mode for
implementing a structure of a storage tank 300 as shown in FIG. 5A
and FIG. 5B will not be limited. Hereinafter, in several
embodiments of the present disclosure, several technical solutions
that can implement the structure of the above-described storage
tank 300 will be provided.
For example, in at least one embodiment of the present disclosure,
in a length direction of a storage tank, a height of an end portion
of the storage tank is smaller than a height of a portion of the
storage tank that is located between two end portions. Exemplarily,
as shown in FIG. 5A an FIG. 5B, a height of a short side wall 320
is smaller than a height of a long side wall 310 (regardless of a
common boundary which is shared by the long side wall 310 and the
short side wall 320); or a height of the short side wall 320 and a
portion of the long side wall 310 that is directly connected with
the short side wall 320 is smaller than a height of a remaining
portion of the long side wall 310 of the storage tank 300; or a
height of an end portion of the long side wall 310 and a height of
the short side wall 320 is smaller than a height of a remaining
portion of the long side wall 310. For example, in the embodiment
of the present disclosure, a position of a region where the height
of the long side wall 310 is the largest (a portion having a
largest distance from a base 100 at an edge of the long side wall
310 that is away from the base) will not be limited, and the
position may be any region located between two end portions of the
long side wall 310. For example, in at least one embodiment of the
present disclosure, with respect to each long side wall 310, in a
direction from an end portion to a center of the long side wall 310
that is located between two end portions, a height gradually
increases.
For example, in at least one embodiment of the present disclosure,
in a length direction of a storage tank, in a direction from an end
portion of the storage tank to a portion of the storage tank that
is located between two end portions, at a same height with respect
to a base, a lyophobic property of the storage tank gradually
decreases. Exemplarily, as shown in FIG. 5A and FIG. 5B, at a same
height with respect to a base 100, a lyophobic property of a long
side wall 310 is weaker than a lyophobic property of a short side
wall 320; or a lyophobic property of an intermediate portion of the
long side wall 310 is weaker than a lyophobic property of the short
side wall 320 and an end portion of the long side wall 310. Related
contents in the foregoing embodiments (for example, the embodiment
shown in FIG. 4B) may be referred to for a relationship between a
shape of the storage tank 300 (for example, a shape of the long
side wall 310) and its lyophobic property distribution, which will
not be repeated here in the embodiment of the present
disclosure.
For example, in at least one embodiment of the present disclosure,
a storage tank further includes a width direction perpendicular to
a length direction (for example, a direction parallel to an X
axis); for example, an extending direction of a short side wall of
the storage tank may be parallel to the width direction. For
example, in at least one embodiment of the present disclosure, at a
same height with respect to a base, wettability of both ends of a
short side wall to a storage material is stronger than wettability
of a portion of the short side wall that is located between the two
ends to the storage material. Exemplarily, as shown in FIG. 5A an
FIG. 5B, in a direction from an end portion of a short side wall
320 to an intermediate position (for example, a center) of the
short side wall 320, at a same height with respect to a base 100,
wettability of a storage tank 300 to a storage material gradually
decreases. In this way, for example, a climbing ability of the
storage material in a region close to the short side wall 320 may
be further reduced, so as to further reduce a flow volume of the
storage material toward the short side wall 320 during a drying
process, which improves distribution uniformity of the storage
material in a direction of an X-axis, and improves flatness of a
structure formed of the storage material.
In at least one embodiment of the present disclosure, related
description of a solution about a long side wall 310 as shown in
FIG. 4B may be referred to for a method for implementing
distribution of wettability of a short side walls 320 as shown in
FIG. 5A and FIG. 5B, which will not be repeated here.
For example, in at least one embodiment of the present disclosure,
in a direction from both ends of a short side wall to a portion of
the short side wall that is located between the two ends, a height
of a storage tank gradually decreases. Exemplarily, as shown in
FIG. 5A and FIG. 5B, with respect to each short side wall 320, in a
direction from an end portion of the short side wall 320 to a
portion of the short side wall 320 that is located between two ends
(for example, a center of the short side wall 320), a height of the
side wall gradually decreases. For example, in at least one
embodiment of the present disclosure, in a direction from both ends
of a short side wall to a portion of the short side wall that is
located between the two ends, at a same height with respect to a
base, a lyophobic property of a storage tank gradually increases.
Exemplarily, as shown in FIG. 5A and FIG. 5B, with respect to each
short side wall 320, in a direction from an end portion to a center
of the short side wall 320, at a same height with respect to a base
100, a lyophobic property gradually increases. In this way, for
example, a climbing ability of a storage material in a central
region close to the short side wall 320 may be further reduced, so
that a flow volume of the storage material toward the central
region at the short side wall 320 may be reduced during a drying
process, which improves distribution uniformity of the storage
material in a direction of an X-axis, and improves flatness of a
structure formed of the storage material.
For example, in at least one embodiment of the present disclosure,
a slope angle of a side surface of a long side wall is smaller than
a slope angle of a side surface of a short side wall. FIG. 5C is a
cross-sectional view of another storage tank in the display
substrate shown in FIG. 3, which is a cross-sectional view of a
storage tank 300 along a width direction; and FIG. 5D is another
cross-sectional view of another storage tank in the display
substrate shown in FIG. 3, which is a cross-sectional view of the
storage tank 300 along a length direction. Exemplarily, a slope
angle of a long side wall 310 (a slope angle of a side surface at
the long side wall 310) is larger than a slope angle of a short
side wall 320 (a slope angle of a side surface at the short side
wall 320), that is, the short side wall 320 is steeper than the
long side wall 310. For example, as shown in FIG. 5C and FIG. 5D, a
slope angle Q1 of the long side wall 310 is an included angle
between a plane where the long side wall 310 is located and a plane
where a base 100 is located, and a slope angle Q2 of the short side
wall 320 is an included angle between a plane where the short side
wall 320 is located and a plane where the base 100 is located. As
compared with the short side wall 320, the long side wall 310 has a
larger slope angle, so that, for example, a climbing ability of a
storage material on the short side wall 320 is weaker than, for
example, a climbing ability of the storage material on the long
side wall 310, which may further reduce a flow volume of the
storage material toward the short side wall 320, and improve
flatness of a structure formed of the storage material. In this
embodiment, related description in the foregoing embodiments (for
example, the embodiments shown in FIG. 4D and FIG. 4E) may be
referred to for formation of the long side wall 310 and the short
side wall 320 in the storage tank 300, a difference in slope angle
between the long side wall 310 and the short side wall 320,
specific shapes of the long side wall 310 and the short side wall
320, and the like.
In at least one embodiment of the present disclosure, a degree of a
difference between a slope angle Q1 of a long side wall 310 of a
storage tank and a slope angle Q2 of a short side wall 320 of the
storage tank will not be limited, which may be designed according
to actual needs. For example, in a storage tank structure shown in
FIG. 5C and FIG. 5D, a value obtained by deducting the slope angle
Q2 of the short side wall 320 from the slope angle Q1 of the long
side wall 310 is no less than 15 degrees.
In at least one embodiment of the present disclosure, a planar
shape of a storage tank 300 will not be limited. For example, the
planar shape of the storage tank 300 is not limited to a rectangle
in FIG. 3, and may also be an ellipse, a polygon, and the like.
Hereinafter, a structure of the storage tank 300 according to the
embodiment of the present disclosure will be analyzed with a case
where the planar shape of the storage tank 300 is an ellipse as an
example.
For example, in at least one embodiment of the present disclosure,
a planar shape of a storage tank is an ellipse, the ellipse
includes two long side walls that are connected with and opposite
to each other, and end portions of the storage tank in a length
direction include end portions of the two long side walls that are
located in the length direction. FIG. 6 is a plan view of another
sub-pixel region in a display substrate provided by an embodiment
of the present disclosure. As shown in FIG. 6, a planar shape of a
storage tank 300 located in a pixel defining layer 200 is an
ellipse, two long side walls 310 of the storage tank 300 are
directly connected with each other and respectively located on both
sides of a dashed line P, and the dashed line P may be an extension
line of a connection line between two focal points of the ellipse.
A direction where the dashed line P is located may be a length
direction of the storage tank 300, for example, parallel to a Y
axis; a direction perpendicular to the direction where the dashed
line P is located may be a width direction of the storage tank 300,
for example, parallel to an X axis. For example, in the length
direction of the storage tank 300, both ends of the storage tank
300 may include two end portions of the two long side walls 310;
and for example, in the width direction of the storage tank 300,
both ends of the storage tank 300 may include intermediate portions
of the two long side walls 310.
FIG. 7A is a front view of a storage tank in the display substrate
shown in FIG. 6, and FIG. 7B is a side view of a storage tank in
the display substrate shown in FIG. 6. As shown in FIG. 7A and FIG.
7B, in the length direction of the storage tank 300, wettability of
an end portion of the storage tank 300 to a storage material is
stronger than wettability of a portion between two end portions of
the storage tank 300 to the storage material. Further, with respect
to each long side wall 310, in a direction from the end portion to
a center of the long side wall 310 that is located between two end
portions, at a same height with respect to a base 100, wettability
of the storage tank 300 to the storage material gradually
decreases. During an evaporating and drying process of the storage
material, the above-described structure of the storage tank 300 may
reduce a flow volume of the storage material along an X-axis
direction, and may further improve uniformity of distribution of
the storage material in a Y-axis direction.
For example, as shown in FIG. 7A and FIG. 7B, in a direction
parallel to the Y-axis (the length direction of the storage tank
300), a height of the two end portions of the storage tank 300 is
larger than a height of the intermediate portion of the storage
tank 300. Further, for example, in the direction parallel to the
X-axis (the width direction of the storage tank 300), a height of
the elliptical storage tank 300 gradually increases from both ends
to the center.
For example, as shown in FIG. 7A and FIG. 7B, in the direction
parallel to the Y-axis (the length direction of the storage tank
300), at a same height with respect to the base 100, a lyophobic
property of the two end portions of the storage tank 300 is weaker
than a lyophobic property of the intermediate portion of the
storage tank 300. Further, for example, in the direction parallel
to the X-axis (the width direction of the storage tank 300), at a
same height with respect to the base 100, a lyophobic property of
the elliptical storage tank 300 gradually decreases from two ends
to the center.
Related contents in the embodiments shown in FIG. 4B to FIG. 4F may
be referred to for related design structures and technical effects
of the storage tank 300 shown in FIG. 7A and FIG. 7B, which will
not be repeated here in the embodiment of the present
disclosure.
For example, in the embodiment shown in FIG. 7A and FIG. 7B, the
two long side walls 310 of the elliptical storage tank 300 are
directly connected with each other, so a distribution rule of a
slope angle of a side surface (the long side wall 310) of the
storage tank 300 may be designed such that: in the direction
parallel to the Y axis, the slope angle of the long side wall 310
gradually decreases from the two ends of the storage tank 300 to
the intermediate region (for example, the center) of the storage
tank 300.
FIG. 8A is a front view of a storage tank in the display substrate
shown in FIG. 6, and FIG. 8B is a side view of the storage tank in
the display substrate shown in FIG. 6.
For example, in at least one embodiment of the present disclosure,
as shown in FIG. 8A and FIG. 8B, in a length direction of a storage
tank 300, wettability of an end portion of the storage tank 300 to
a storage material is weaker than wettability of a portion between
the two end portions of the storage tank 300 to the storage
material. Further, with respect to each long side wall 310, in a
direction from the end portion to a center of the long side wall
310 between the two end portions, at a same height with respect to
a base 100, wettability of the storage tank 300 to the storage
material gradually increases. During an evaporating and drying
process of the storage material, the above-described structure of
the storage tank 300 may reduce a flow volume of the storage
material along a Y-axis direction, and may further improve
uniformity of distribution of the storage material in an X-axis
direction.
For example, as shown in FIG. 8A and FIG. 8B, in a direction
parallel to the Y-axis (the length direction of the storage tank
300), a height of two end portions of the storage tank 300 is
smaller than a height of an intermediate portion of the storage
tank 300. Further, for example, in a direction parallel to the
X-axis (the width direction of the storage tank 300), a height of
the elliptical storage tank 300 gradually decreases from both ends
to the center.
For example, as shown in FIG. 8A and FIG. 8B, in the direction
parallel to the Y-axis (the length direction of the storage tank
300), at a same height with respect to the base 100, a lyophobic
property of the two end portions of the storage tank 300 is
stronger than a lyophobic property of the intermediate portion of
the storage tank 300. Further, for example, in the direction
parallel to the X-axis (the width direction of the storage tank
300), at a same height with respect to the base 100, a lyophobic
property of the elliptical storage tank 300 gradually increases
from both ends to the center.
Related contents in the embodiments shown in FIG. 5A to FIG. 5D may
be referred to for related design structures and technical effects
of the storage tank 300 shown in FIG. 8A and FIG. 8B, which will
not be repeated here in the embodiment of the present
disclosure.
For example, in the embodiment shown in FIG. 8A and FIG. 8B, the
two long side walls 310 of the elliptical storage tank 300 are
directly connected with each other, so a distribution rule of a
slope angle of a side surface (the long side wall 310) of the
storage tank 300 may be designed such that: in the direction
parallel to the Y axis, the slope angle of the long side wall 310
gradually increases from both ends of the storage tank 300 to the
intermediate region (for example, the center) of the storage tank
300.
For example, in at least one embodiment of the present disclosure,
FIG. 9 is a partial structural schematic diagram of a display
substrate provided by the embodiment of the present disclosure. As
shown in FIG. 9, the display substrate may further comprise an
organic light emitting device 400 provided in a storage tank
300.
In at least one embodiment of the present disclosure, a specific
structure of an organic light emitting device 400 will not be
limited. For example, the organic light emitting device 400 may
include a first electrode 410, a second electrode 430, and an
organic light emitting layer 420 located between the first
electrode 410 and the second electrode 430. For example, the
organic light emitting device 400 may further include a structure
such as a hole injection layer, a hole transport layer, an electron
transport layer and an electron injection layer. In a process of
manufacturing the organic light emitting device 400, a storage
material in a storage tank 300 may be configured to form one or a
combination of the organic light emitting layer 420, the hole
injection layer, the hole transport layer, the electron transport
layer and the electron injection layer in the organic light
emitting device 400.
In at least one embodiment of the present disclosure, a type of a
storage material in a storage tank 300 will not be limited. The
storage material may include a solvent and a solute. For example,
during a drying process, the solvent evaporates, and the remaining
solute forms a structural layer, for example, an organic light
emitting layer 420, and the like, in a desired organic light
emitting device 400.
In at least one embodiment of the present disclosure, a type of a
solvent in a storage material will not be limited. For example, the
type of the solvent may be one or a combination of materials below.
The type of the solvent may be aromatic hydrocarbons: benzene,
toluene, xylene, and the like; aliphatic hydrocarbons: pentane,
hexane, octane, and the like; alicyclic hydrocarbons: cyclohexane,
cyclohexanone, toluene cyclohexanone, and the like; halogenated
hydrocarbons: chlorobenzene, dichlorobenzene, dichloromethane, and
the like; alcohols: methanol, ethanol, isopropanol, and the like;
ethers: ether, propylene oxide, and the like; esters: methyl
acetate, ethyl acetate, propyl acetate, and the like; ketones:
acetone, methyl butanone, methyl isobutyl ketone, and the like;
diol derivatives: ethylene glycol monomethyl ether, ethylene glycol
monoethyl ether, ethylene glycol monobutyl ether, and the like;
others: acetonitrile, pyridine, phenol, and the like.
In at least one embodiment of the present disclosure, a type of a
solute in a storage material will not be limited, and the type of
the solute may be determined by a type of a structural layer in an
organic light emitting device 400 to be formed.
For example, in at least one embodiment of the present disclosure,
a material for manufacturing an organic light emitting layer 420
may include 8-hydroxyquinoline aluminum, derivatives of
8-hydroxyquinoline aluminum and anthracene, and the like.
For example, in at least one embodiment of the present disclosure,
a material for manufacturing a hole injection layer includes
phthalocyanine copper, molybdenum trioxide,
4,4',4''-tris(2-naphthylphenyl amino)triphenylamine (2-TNATA),
polyaniline, polymer of 3,4-ethylene dioxothiophene monomer
(PEDOT), and the like.
For example, in at least one embodiment of the present disclosure,
a material for manufacturing a hole transport layer includes
poly-phenylene vinylenes, polythiophenes, polysilanes,
triphenylmethanes, triarylamines, hydrazones, pyrazolines, chewable
azoles, carbazoles, butadienes, and the like.
For example, in at least one embodiment of the present disclosure,
a material for manufacturing an electron injection layer includes
lithium fluoride, lithium oxide, lithium boron oxide, potassium
silicate oxide, cesium carbonate, 8-hydroxyquinoline
aluminum-lithium, and the like.
For example, in at least one embodiment of the present disclosure,
a material for manufacturing an electron transport layer includes
oxazole derivatives, metal chelates, azole compounds, quinoline
derivatives, oxaline derivatives, diazoanthracene derivatives,
heterocyclic derivatives containing silicon, and the like.
In at least one embodiment of the present disclosure, as shown in
FIG. 9, types of a first electrode 410 and a second electrode 430
will not be limited. For example, one of the first electrode 410
and the second electrode 430 may serve as an anode of an organic
light emitting device 400, and the other as a cathode of the
organic light emitting device 400. For example, a material for
manufacturing the anode may include any one of a metal aluminum, a
conductive oxide (for example, ITO, IGZO), and the like. For
example, a material for manufacturing the cathode includes any one
of potassium, lithium, calcium, magnesium, indium or a magnesium
aluminum alloy, a magnesium silver alloy and a lithium aluminum
alloy. For example, a thin film transistor 500 is further provided
in a display substrate of each sub-pixel region; and the thin film
transistor 500, for example, may be electrically connected with the
first electrode 410, to control an operating state of the organic
light emitting device 400.
At least one embodiment of the present disclosure provides a
display panel, and the display panel may comprise the display
substrate according to any one of the above-described embodiments.
For example, the display panel may be applied to a mobile phone, a
tablet personal computer, a television, a monitor, a laptop, a
digital photo frame, a navigator, and any other product or
component having a display function.
At least one embodiment of the present disclosure provides a
manufacturing method of a display substrate, the method comprising:
providing a base; forming an insulating material film on the base;
patterning the insulating material film to form a pixel defining
layer, the pixel defining layer including a plurality of sub-pixel
regions, and each sub-pixel region being provided therein with at
least one storage tank formed as enclosed by the pixel defining
layer, wherein, at a same height with respect to the base, in a
length direction of the storage tank, an end portion of the storage
tank and a portion between two end portions of the storage tank
differ in wettability to a storage material. On a same horizontal
plane, respective portions of the manufactured storage tank differ
in wettability to the storage material; and distribution of
wettability in respective regions of the storage tank may be
designed according to distribution of the storage material in a
drying process, to control an interface of the storage material in
the drying process, so as to improve flatness of a structural layer
formed of the storage material, and further improve a yield of the
manufactured display substrate.
It should be noted that, in at least one embodiment of the present
disclosure, related contents in the foregoing embodiments (the
embodiments about the display substrate), for example, the
embodiments in FIG. 4B to FIG. 4F, or the embodiments in FIG. 5A to
FIG. 5D, may be referred to for a structure of a storage tank
formed by using the above-described manufacturing method, which
will not be repeated here.
For example, in a manufacturing method of a display substrate
provided by at least one embodiment of the present disclosure, in a
length direction of a storage tank, in a direction from an end
portion of the storage tank to a central portion of the storage
tank that is located between two end portions, at a same height
with respect to a base, wettability gradually decreases or
increases. For example, with respect to each long side wall of the
manufactured storage tank, as shown in FIG. 4B to FIG. 4C, in a
direction from an end portion of a long side wall 310 to a center
of the long side wall 310, a height of an edge of the storage tank
300 away from a base 100 gradually decreases. For example, with
respect to each long side wall 310 of the manufactured storage
tank, as shown in FIG. 5A to FIG. 5B, in a direction from the end
portion of the long side wall 310 to the center of the long side
wall 310, the height of the edge of the storage tank 300 away from
the base 100 gradually increases.
For example, in a manufacturing method of a display substrate
provided by at least one embodiment of the present disclosure, a
storage tank further includes a width direction perpendicular to a
length direction; and in the width direction, in a direction from
an end portion of the storage tank to a center of the storage tank
that is located between two end portions, at a same height with
respect to a base, wettability gradually increases. Exemplarily,
the storage tank further includes two opposite short side walls; a
length of the short side wall is smaller than a length of a long
side wall and two ends of each short side wall are respectively
connected with two long side walls; and in a direction from an end
portion of the short side wall to a center of the short side wall
that is located between two end portions, at a same height with
respect to the base, wettability gradually increases or decreases.
Related contents in the embodiments in FIG. 4B to FIG. 4C, and the
embodiments in FIG. 5A to FIG. 5B may be respectively referred to
for related design of a shape of the long side wall and a shape of
the short side wall, which will not be repeated here in the
embodiment of the present disclosure.
According to a shape of a storage tank 300, a pixel defining layer
200 is processed correspondingly, so that a lyophobic property of
the storage tank 300 for a storage material also gradually
increases or decreases in the direction from an end portion to a
center between two end portions. Hereinafter, description will be
provided with several embodiments.
For example, in a manufacturing method of a display substrate
provided by at least one embodiment of the present disclosure, a
material for manufacturing a pixel defining layer includes a
halogen polymer, and the manufacturing method further comprises:
baking the pixel defining layer, so that a portion of the pixel
defining layer away from a base becomes a lyophobic layer, and a
portion of the pixel defining layer close to the base is
transformed into a lyophilic layer. For example, the halogen
polymer may include fluorine; and after the pixel defining layer is
baked, a halogen, for example, fluorine, may aggregate toward a
surface of the pixel defining layer, so that the surface of the
pixel defining layer has a lyophobic property; in addition, the
lyophobic property of the pixel defining layer gradually increases
from a position close to the base to the surface of the pixel
defining layer. Therefore, the formed storage tank structure may
directly allow lyophobic property distribution in the storage tank
to meet requirements.
For example, in a manufacturing method of a display substrate
provided by at least one embodiment of the present disclosure, a
material for manufacturing a pixel defining layer includes a
lyophilic photoresist material, and the manufacturing method
further comprises: performing plasma treatment on a surface of the
pixel defining layer away from a base with a gas including a
halogen compound, so that a portion of the pixel defining layer
away from the base has a lyophobic property. Thus, from a position
close to the base to the surface of the pixel defining layer, a
content of the halogen compound gradually increases, and the
lyophobic property of the pixel defining layer also gradually
increases.
In at least one embodiment of the present disclosure, a type of a
gas including a halogen compound will not be limited. For example,
the halogen compound may be one or a combination of carbon
tetrafluoride, sulfur tetrafluoride or nitrogen trifluoride, and
the like.
With respect to different storage tank structures, lyophobic
property distribution in the storage tank is also different, and
related contents in the embodiments in FIG. 4B to FIG. 4C, and the
embodiments in FIG. 5A to FIG. 5B may be respectively referred to
for related contents, which will not be repeated here in the
embodiment of the present disclosure.
For example, in a manufacturing method of a display substrate
provided by at least one embodiment of the present disclosure, a
surface of a pixel defining layer may be treated with a plasma gas
including a halogen compound. Thus, according to a structure of a
storage tank, a difference in wettability among respectively
regions of the storage tank on a same horizontal plane may be
increased, and in a drying process of a storage material, an
ability of the storage tank to adjust an interface of the storage
material may be further improved, to improve flatness of a
structural layer manufactured from the storage material. For
example, with a storage tank structure shown in FIG. 4B to FIG. 4E
as an example, on a same horizontal plane, a lyophobic property of
a long side wall 310 is stronger than a lyophobic property of a
short side wall 320; after the above-described plasma gas
treatment, the lyophobic property of the long side wall 310 is
still stronger than the lyophobic property of the short side wall
320; and a difference between the two increases. In this way, as
compared with a region at the short side wall 320, a flow volume of
the storage material toward the long side wall 310 may be further
reduced, which may further improve distribution uniformity of the
storage material in a direction of a Y-axis, and ultimately further
improve flatness of a structure formed of the storage material.
For example, a manufacturing method of a display substrate provided
by at least one embodiment of the present disclosure, as shown in
FIG. 9, further comprises forming an organic light emitting device
400 in a storage tank 300. Related contents in the foregoing
embodiment (the embodiment related to the display substrate shown
in FIG. 9) may be referred to for a specific structure of the
organic light emitting device 400, which will not be repeated here
in the embodiment of the present disclosure.
Exemplarily, after manufacturing of the storage tank 300 is
completed, a storage material may be dropped into the storage tank
and then dried to obtain a structural layer in the organic light
emitting device 400. Sub-pixel regions in the display substrate may
be respectively three types: i.e., a red sub-pixel, a green
sub-pixel and a blue sub-pixel; after a hole injection layer and a
hole transport layer or an electron injection layer and an electron
transport layer are simultaneously manufactured in storage tanks of
different sub-pixel regions, organic light emitting layers of three
light-emitting colors of red, green and blue may be respectively
manufactured in the storage tanks of sub-pixel regions of different
types. For example, the storage material may also be respectively
dropped in a storage tank of each sub-pixel region of the display
substrate, to obtain a structural layer in the organic light
emitting device 400.
At least one embodiment of the present disclosure provides a
display substrate and a manufacturing method thereof, and a display
panel, and may have at least one advantageous effect below:
(1) At least one embodiment of the present disclosure provides a
display substrate, wherein, on a same horizontal plane, respective
portions of a storage tank differ in wettability to a storage
material; and distribution of wettability in respective regions of
the storage tank may be designed according to distribution of the
storage material in a drying process, to control an interface of
the storage material in the drying process, so as to improve
flatness of a structural layer formed of the storage material.
(2) In a display substrate provided by at least one embodiment of
the present disclosure, in a length direction of a storage tank, in
a direction from two end portions to an intermediate region,
wettability of the storage tank to a storage material gradually
decreases, which may improve distribution uniformity of the storage
material in the length direction of the storage tank, and
ultimately increase flatness of a structure formed of the storage
material.
(3) In a display substrate provided by at least one embodiment of
the present disclosure, in a length direction of a storage tank, in
a direction from two end portions to an intermediate region,
wettability of the storage tank to a storage material gradually
increases, which may improve distribution uniformity of the storage
material in a width direction of the storage tank, and ultimately
increase flatness of a structure formed of the storage
material.
For the present disclosure, the following statements should be
noted:
(1) The accompanying drawings involve only the structure(s) in
connection with the embodiment(s) of the present disclosure, and
other structure(s) can be referred to common design(s).
(2) For the purpose of clarity only, in accompanying drawings for
illustrating the embodiment(s) of the present disclosure, the
thickness and size of a layer or a structure may be enlarged, that
is, the accompanying drawings are not drawn according to the actual
scale.
(3) In case of no conflict, features in one embodiment or in
different embodiments can be combined to obtain a new
embodiment.
What are described above is related to the specific embodiments of
the disclosure only and not limitative to the scope of the
disclosure. The protection scope of the disclosure shall be based
on the protection scope of the claims.
* * * * *